Device



Sept. 6 HOFFMANN 1,876,499

HOOP IRON BAND OR THE LIKE TENSIONING AND FASTENING DEVICE Fil ad De 11 1 2 Sheets-Sheet l g alw-c Sept. 6, 1932. E, HOFFMANN 1,876,499

HOOP IRDN BAND OR THE LIKE TBNSIQNING AND FASTENING DEVICE Filed Dec. 11. 1931 2 s s t 2 Fig. 6

IN vgrv r04 5. Ho F'FMA lwv Patented Sept. 6, 1932 UNITED STATES PATENT OFFICE EMIL HOFFMANH, OF GOLOGNE, GERMANY:

HOOP-IRON BAND OR THE LIKE TENSIONING AND FASTENING DEVICE Application filed December 11, 1831, Serial No. 580,

The invention relates to a device for tensioning and fastening a band, hoop or strap of hoop-iron or the like around a bale, package or the like, havirw a lever for pressing a roughened or serrated roller on to the hoop, a lever for rotating the tensioning roller, a lever operating means for effecting the fastening of the strap.

According to the present invention, simultaneously with, and as a result of, the initial movement of the lever which presses down the tensioning roller, a stamping member is automatically lowered to engage the strap and a locking sleeve thereon, and maintain them in position during the tensioning operation and until the fastening has been effected, whereby faulty fastening is avoided. Further, accordingto the invention, a knife is provided to cut off the over-lapping end of the stra or to cut it so deeply that it may be readily roken off by being bent once at the incision, after the fastening has been effected. The cutting-off knife may be guided by a cam on the stampin member so that the cuttingofi knife can e adjusted relativel to the stamping member to regulate the epth of its incisiorf.

In a preferred embodiment, the lever which presses down the tensioning roller is ada ted, when in its inoperative position, to hol the ,stamping member in a raised position. For this purpose,the lever is provided with ahook member ada ted to engage a pin on the looking lever. T ing member in a raised position, but releases it when the above mentioned hook and pin are disengaged owing to a small initial movement which is given to the locking key by, for example, a spring pressed plunger having limited movement.

A tensioning, fastening and cutting-0'5 device constructed in accordance with the present invention is shown by way of example in the accompanying drawings, in which Figure 1 is, a side elevation of the device and B e locking lever holds the stampand in Germany March 23, 1980.

before use, with the two superposed ends of a hoop-iron strap and a locking sleeve in position.

Figure 2 is a section of the device in use.

Figure 3 is a plan view corresponding to Figure 2. K

Figure 4 is a detail view showing the knife for making incisions in the hoop-iron strap and the locking sleeve.

Figure 5 is a side cross-sectional elevation an a larger scale through the stamping mem- Figure 6 is a diagrammatic front elevation showing the strap and locking sleeve, and the cutting oif knife after the strap has been fastened. t

Figure 7 is a rear elevation of the stamping device.

Figure 8 is a. front sectional elevation through the stamping device.

The hoop-iron strap 6, of which only the ends are shown in the drawings, is placed around a package or bale and one end inserted in a locking sleeve 7. The other end of the band 6 is inserted in the other end of the machine and superimposed on the first mentioned end so that it occupies a position as shown in igure 1.

The means for tensioning the hoop comprise, in known manner, a peripherally roughened or serrated roller 2, which is carried by an eccentrically mounted shaft 1, whereby it can be firmly pressed down upon the end of the hoop 6 by movement of the lever 4, which is provided with a handle 28 for the purpose. The shaft 1 is mounted ecoentrically and rigidly in the shaft of lever 4 and the shaft of lever 4 is formed in two parts which are mounted in the frame of the machine, as shown in Figure 3. A lever 3, mounted so that it is free to oscillate on shaft 1, is provided with a pawl 29, which enga s a ratchet wheel 30 carried by the shaft 1. he serrated wheel 2 is thereby rotated by a backward and forward movement of the lever B, so

' 1n the device so that the that after the wheel 2 has been firmly pressed down onthe end of the hoop 6, it can be rotated in a clockwise direction and draw the upper end towards the left and so tension the hoop. The lower end, over which the upper end slides, bears on a roughened saddle 5.

After tensioning the hoop in the manner above described, it is fastened, in known manner, by making incisions in the locking sleeve 7 and the overlapping ends.

The fastening operation is effected by a vertically guided stamping member 8, in which a knife 9, having inclined cutting edges 17, is interchangeab secured. The member 8 is actuated by a ouble cam 10, which is rotated by a lever 11 and acts on rollers 18 mounted on the member 8.

The member 8 is provided with a central rib which acts as a supporting bridge for the spindle of the rollers and has a hook shaped extension 12 which is adapted to be engaged by a pin 13 mounted on the cam 10, when the lever 11 occupies a position as shown in Figure 5. Thus, the'member 8, together with the knife 9, is raised from the hoop towards the end of the rearward movement of the lever 11.

The lever 11 is provided with a laterally projecting pin 14 which is adapted to be engaged by a hook 15, which is rigidly connected to and moved positively by the lever 4, when the two levers 4 and 11 are in their inoperative positions, as shown in Figure 1. In this manner, the member 8 is held in a raised position when the lever 4 and the tightening roller 2 are in inoperative positions.

When the pin 14 is released from the hook 15, the lever 11 is slightly raised by a spring pressed plunger 16 having a limited movement; as a result, the pin 13 disengages from the hook 12 and the stamping member 8 drops onto the locking sleeve 7, which is thereby, under the action of the inclined cutting edges 17 of the knife 9, moved into a central position, so that the subsequent notching or cutting of the longitudinal edges of the locking sleeve and the ends of the hoop-iron strap can be accurately effected and a faulty locking avoided.

The operation of the device is greatly facilitated and simplified by the alternating action of the tensioning and locking means.

In operation, the ends of the band 6, together with the locking sleeve 7, are inserted occupy the positions shown in Figure 1. he lever 4 is swung t0 the left to press the serrated roller 2 onto the band; The movement of the lever 4 releases the in 14 on the lever 11, which is consequent y slightly raised by the spring pressed plunger 16. The pin 18 is moved out of engagement with the hook 12 and the stamp 8, to ther with the knife 9, therebv allowed to 5511, so that the locking sleeve 7 and the ends of the hoop are centrally placed and the knife 9 set firmly thereon. The hoop 6 is then tensioned by oscillation of the lever 3, which rotates the firmly pressed roller 2. When the hoop is sufficiently taut, it is fastened by swinging the lever 11 to the right (Figure 2), the action of the cam 10 on the rollers 18 of the stamping member 8 thus forcing the knife 9 against the locking sleeve 7, so that it forms incisions in the longitudinal edges thereof and also in the edges of the ends of the band, whereby the band is securely fastened in known manner.

In order to facilitate the removal of the excess overlapping end of the upper strand of the hoop 6, a cutting off knife 19 is provided. The forward end of the cutting-off knife 19 is rounded oif as indicated at 20 to facilitate the insertion of the strap. The knife 19 is moved up and down by the stamping member 8, the knife having two pins 21 engaging with an inclined slot 22 in the stamping member 8. In order to regulate the depth of the cut made by the knife 19 in the upper strand of the hoop-iron band 6, the lmife may be adjusted in the direction of its own length relatively to the slot 22. This adjustment is controlled by a disc 23 mounted on a screw threaded stud 24 in the fixed body of the device. The lower edge of the disc engages in a recess 25 at the rear of the knife so that rotation of the disc on its stud moves the pins 21 alon the inclined slot 22. The disc can be locke in any adjusted position by means of a screw 26.

Thus, the movement of the stamp 8 not only causes the knife 9 to cut through the two ends of the band 6 and the sleeve 7 to fasten the band, but it also moves the knife 19 do'wn to cut into the upper overlapping end of the band 6, as is clearly shown in Figure 6. The knife 19 may be adjusted to sever the band completely or to make a deep incision so that the end of the band may be bent once to break it ofl', after the tensioning and fastening device has been returned to its inoperative position.

I claim:

1. A device for tensioning and fastening a hoop-iron band around bales packages and the like comprising a support for the overlapping ends of the band and of a locking sleeve, a roughened tensioning roller, a lever for pressing said tensioning roller onto the band, a lever for rotating said tensioning roller. means including a stamping member for effecting the fastening of the band, a lever for operating said means, and means responsive to the initial movement of the lever which presses down the tensioning roller to automatically lower said stamping member to engage said sleeve and overlapping ends of the band and to maintain them in position durin' the tensionin operation and until the fastenln has been e ected.

2. A evice according to claim 1, wherein the lever which presses down the tensioning roller holds the stamping member in a raise position while said ever and the lever for operating the fastening means are in their inoperative positions.

3. A device according to claim 1, including a hook on the lever which resses down the tensioning roller, a pin on t e lever for operating the fastening means for engagement by said hook and means to give a small initial movement to said latter lever when said hook is disen aged from said pin.

4. A evice according to claim 1, including a hook on the lever which presses down the tensioning roller, a pin on the lever for operating the fastening means for eggagement by said hook and a spring press plunger to 've a small initial movement to said latter ever when said hook is disengaged from said 5. A device according to claim 1, including a cuttin -olf knife supported by and movable wit the stamping member to cut the overlapping endof the strap.

6. A device according to claim 1, including a stamping member having an inclined slot for effecting the fastening of the band and a cutting off knife having pins which en age the inclined slot in said fastening kni e to so permit of adjustment in the depth of incision.

In testimony whereof I have signed my name to this specification.

EMIL HOFFMANN.

CERTIFICATE OF CORRECTION.

Patent No. l,876,499. September 6, 1932.

EMIL HOFFMANN.

It is hereby certified that error appears in the printed specification of the i above numbered patent requiring correction as follows: Page 1, in the heading to the specification, date of filing application in Germany, for "March 23,

1930" read "March 3, i930"; and that the said Letters Patent should be read with this correction therein that the same may conformto the record of disease in the-Patent Office.

Signed and sealed this 17th day of January, A. D. 1933.

(Seal) Act in: (loddui'lsimf Patents.

the lever which presses down the tensioning roller holds the stamping member in a raise position while said ever and the lever for operating the fastening means are in their inoperative positions.

3. A device according to claim 1, including a hook on the lever which resses down the tensioning roller, a pin on t e lever for operating the fastening means for engagement by said hook and means to give a small initial movement to said latter lever when said hook is disen aged from said pin.

4. A evice according to claim 1, including a hook on the lever which presses down the tensioning roller, a pin on the lever for operating the fastening means for eggagement by said hook and a spring press plunger to 've a small initial movement to said latter ever when said hook is disengaged from said 5. A device according to claim 1, including a cuttin -olf knife supported by and movable wit the stamping member to cut the overlapping endof the strap.

6. A device according to claim 1, including a stamping member having an inclined slot for effecting the fastening of the band and a cutting off knife having pins which en age the inclined slot in said fastening kni e to so permit of adjustment in the depth of incision.

In testimony whereof I have signed my name to this specification.

EMIL HOFFMANN.

CERTIFICATE OF CORRECTION.

Patent No. l,876,499. September 6, 1932.

EMIL HOFFMANN.

It is hereby certified that error appears in the printed specification of the i above numbered patent requiring correction as follows: Page 1, in the heading to the specification, date of filing application in Germany, for "March 23,

1930" read "March 3, i930"; and that the said Letters Patent should be read with this correction therein that the same may conformto the record of disease in the-Patent Office.

Signed and sealed this 17th day of January, A. D. 1933.

(Seal) Act in: (loddui'lsimf Patents. 

